can somebody check this? I've fixed it once but my instructor says it is still wrong.

Factor Completely. If a polynomial is prime, state this.
-2a^2(35a^2 + 34a - 8)

-2a^2(35a + 14a + 20a - 8)

-2a^2(7a(5a -2) + 4(5a -2))

-2a^2(5a - 2)(7a +4)

He says that the signs are wrong and the factorization is as well?

Question

can  somebody check this? I've fixed it once but my instructor says it is still wrong. 

Factor Completely. If a polynomial is prime, state this. 
-2a^2(35a^2 + 34a - 8)

-2a^2(35a + 14a + 20a - 8)

-2a^2(7a(5a -2) + 4(5a -2))

-2a^2(5a - 2)(7a +4)

He says that the signs are wrong and the factorization is as well?

savvy · Answer

in step 3, observe that it wud b 5a+2 in the first bracket...

anonymous · Answer

ohh thank you. I figured he meant something else. So I switch the - to a plus? Do I need to fix the others?

anonymous · Answer

I think you forgot to make a^2 on the second step

anonymous · Answer

where?

jhonyy9 · Answer

on second line you have wrote 35a when right is 35a^2

anonymous · Answer

thank you. Still kinda lost on fixing it but I appreciate all the help!

jhonyy9 · Answer

- so can you rewrite it right ,correct newly ?

anonymous · Answer

I just need to fix the signs he said but not sure which it applies to.

jhonyy9 · Answer

yes you need rethink it again on different way